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New breakthroughs in laser-induced breakdown spectroscopy in China
[ Instrument Network Instrument R & D ] Laser-induced breakdown spectroscopy is a new type of dynamic spectrum measurement technology based on laser ablation method. Ultra-short pulse laser focuses the surface of the sample to form a plasma, and then analyzes the plasma emission spectrum to determine the sample's Material composition and content. Because the ultra-short pulse laser has a high energy density after focusing, it can excite samples in any physical state (solid, liquid, gaseous) to form a plasma, so the laser-induced breakdown spectrum is almost not limited by the sample form, and there is no need for the sample. Pre-processing such as slicing and grinding.
But does the surface roughness of the sample really have no effect on the laser-induced breakdown spectrum? Recently, the Institute of Automation of the Chinese Academy of Sciences, Shenyang, has studied the analysis results of laser-induced breakdown spectroscopy under different surface roughness for the effects of "scratches" on the surface of metal workpieces when analyzing the components of laser-induced breakdown spectroscopy. An effective scheme to reduce the influence of roughness on the quantitative analysis of laser-induced breakdown spectroscopy was proposed. At the same time, high-precision quantitative analysis of Cr, Cu, Mn and other elements in carbon steel was realized.
The research team selected 6 carbon steels with surface roughness between 0.03 and 0.5 μm as experimental samples, and used laser-induced breakdown spectroscopy for scanning analysis. When the laser ablation crater was fixed at about 10 μm, the researchers optimized the overlap rate of the ablation crater when collecting spectra under different roughness samples. Finally, it was found that when the laser ablation crater overlap rate was 75%, the spectrum was stable. Sex is the best. And the analysis of Cr, Cu, Mn and other elements in carbon steel verified this finding.
Laser-induced breakdown spectroscopy has the characteristics of being unconstrained by the sample, very destructive to the sample, and full-element analysis. It has shown great application potential in various fields. In recent years, laser-induced breakdown spectroscopy has received more and more attention, and research results have continued to emerge. Shenyang Institute of Automation has achieved a number of results in laser-induced breakdown spectroscopy, and has developed a number of LIBS online detection products.
Although the current laser-induced breakdown spectroscopy technology still has difficulties such as low signal-to-noise ratio, low accuracy, and high measurement cost, but with the efforts of scientific researchers, this technology will continue to improve and show its value in a wider field . With the lessons of lagging analytical techniques such as chromatography and mass spectrometry, China believes that laser-induced breakdown spectroscopy technology will receive greater attention.